Based on what I have been told, most of the people who comply with the undress code at nude beaches are people that would be far better off clothed.
Even at Castaway Cay, we have seen so many people's swim attire that makes you believe that these folks have never owned a mirror. Trying to squeeze 250 pounds into 5 ounces of material is really asking a lot of the material. This goes for both sexes, especially wrinkly old guys (of which I am a full-fledged member!) who feel the need to wear speedo's/thongs that belong on the buff bodies of the much younger. Hmmm...it might be safer to stay at the family beach